Going to do a plug change soon and what to know forum experiences and preferences. I have a 05 Limited NA Coupe with auto trans. Has 77,000 miles and in very good condition. At my age (82) i probably won't drive the car too much longer but want it it tip top shape for next owner. With those things in consideration, do you recommend the Iridium plugs like NGK IX or the Bosch 9600 Iridium? These plugs are supposed to last a long time. Or, would you recommend a lesser expensive plug with shorter life span? I just want a plug that will perform as it's supposed to and not cause a driving problem. I'm interested in all opinions.

Jim